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A Galaxy screen normally goes black when you hold the phone to your ear, then wakes when you move it away. That is proximity-sensor behavior meant to prevent accidental touches. If the screen goes dark at other times, first check whether the phone is idle, whether something is covering the sensor, or whether a Galaxy Z Flip is reacting to a nearby magnet.
First, identify what is turning off
Notice when the display goes black and whether the call itself continues. The timing points to different causes:
- Only when the phone is near your face: This is usually normal proximity-sensor behavior. Move the phone away from your face to wake the display and use the call controls. Samsung explains that the screen turns off near the ear to prevent accidental touches, then turns on when the phone moves away (Samsung US: Samsung phone screen doesn’t turn off or on during calls).
- After the phone has been idle: The Screen timeout setting may be turning off the display. It is separate from call-related sensing. Samsung says a longer timeout uses more battery (Samsung US: Adjust the screen timeout on your Galaxy phone).
- During a call when the phone is not near your face: Check whether a case, screen protector, sticker, dirt, or other obstruction is interfering with the sensor.
- The call ends as well as the display going dark: If you have a Galaxy Z Flip, check for nearby magnetic objects and the phone’s call-ending option.
Try these checks in order
1. Compare with a regular handset call
Make a call with the phone held normally, without speakerphone or Bluetooth earphones. Samsung Gulf says proximity sensing is deactivated when using speakerphone or Bluetooth earphones, though behavior can vary by model and software. A handset call is a useful comparison before concluding there is a sensor problem (Samsung Saudi Arabia: What to do if your Galaxy phone screen turns off during calls).
2. Temporarily remove accessories
Take off the case and screen protector, and remove any stickers or other accessories near the top/front of the phone. Test another call. Samsung lists accessories that cover the sensor as a possible cause; the sensor’s exact location differs among models. Do not assume an accessory is the cause unless the symptom changes when it is removed (Samsung US call-screen troubleshooting).
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3. Clean the front/top area gently
Wipe the area near the sensor with a clean, soft cloth. Samsung’s US display guidance specifies a dry microfiber cloth. Avoid liquids and abrasive tools; the sensor position varies by device (Samsung US: Galaxy phone display is too dim or has brightness issues).
4. Restart and check for updates
End the call, restart the phone, and check for available software updates. Samsung includes restarting and updating among its call-screen troubleshooting steps. Menu names and update paths vary by model and software version; use Settings search if needed (Samsung US call-screen troubleshooting).
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5. If the screen will not wake, check the wake gesture
If the screen stays black after you move the phone away from your face, Samsung advises turning off Double tap to turn on screen under Settings > Advanced features > Motions and gestures as a troubleshooting step. This setting is not a guaranteed fix for every call-screen issue, and its availability may vary (Samsung US call-screen troubleshooting).
Galaxy Z Flip: rule out nearby magnets
Samsung says magnets near an open Galaxy Z Flip can make it register as folded. If the call ends unexpectedly or the device behaves as though it has been folded, move magnetic cases, stickers, and other magnetic objects away from the phone. You can also try turning off Close phone to end calls in Phone app > More options > Settings > Flip options. This advice applies specifically to the documented Z Flip behavior, not to all Galaxy phones (Samsung US: Screen turns off or calls end unexpectedly on Samsung Galaxy Z Flip).
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When to contact Samsung
If the display still behaves unexpectedly after you have removed accessories, cleaned the sensor area, restarted, and checked for updates, contact Samsung Support or arrange a service assessment. A persistent symptom alone does not establish that the sensor has failed.
Samsung Saudi Arabia documents this diagnostic route in its market: Samsung Members > Get help > Diagnostics > View tests > Proximity recognition. The diagnostic and menu path may not be available on every model or in every region (Samsung Saudi Arabia call-screen guidance).
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If the screen dims rather than going black
Dimming is a different symptom from a fully black display. Samsung lists Adaptive brightness and Power saving among possible reasons a Galaxy display may look dim. Check those settings if you can still see the screen; call-related proximity behavior is more relevant when the display goes completely dark (Samsung US display guidance).
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Why your settings may look different
Sensor placement, menu paths, setting names, and feature availability differ by Galaxy model, software version, and region. If a path in this guide does not match your phone, search Settings for the named option or consult support for your specific model (Samsung US call-screen troubleshooting; Samsung US Galaxy Z Flip guidance; Samsung Saudi Arabia call-screen guidance).
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